p2p: WiFi Direct API for Group Creation

new createGroup API accepts the configuration built by
WifiP2pConfig#Builder to create a group.

Bug: 64695709
Test: manual test
      * create a group with pre-defined configuration.
      * join it as new Group Client.
      * join it as legacy Wi-Fi STAs.
Test: Unit tests - atest frameworks/opt/net/wifi/tests/wifitests
Change-Id: Ib6598016ee0e96d8a53638189890ff228bb0f177